install ffmpeg

Dockerfile

@@ -15,6 +15,12 @@ RUN --mount=type=cache,target=/root/.cache/uv \
 ENV VIRTUAL_ENV=/opt/venv \
     PATH="/opt/venv/bin:$PATH"
 
+# Install system dependencies
+RUN apt-get update && \
+    apt-get install -y ffmpeg && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
 # Create user and set permissions (required for HF Spaces)
 RUN useradd -m -u 1000 user && \
     chown -R user /opt/venv